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Fair Value Measurement (Tables) | 12 Months Ended
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Dec. 31, 2018
Fair Value Disclosures [Abstract] |
Schedule of Assets and Liabilities Measured at Fair Value on Recurring Basis | The following table sets forth the fair value of the Company’s financial assets and liabilities measured at fair value on a recurring basis based on the three-tier fair value hierarchy (in thousands):
| December 31, 2018
| Level 1 |  | Level 2 |  | Level 3 |  | Total
Assets |  |  |  |  |  |  |
Money market funds[1] | $ | 15,223 |  |  | $ | — |  |  | $ | — |  |  | $ | 15,223 |
U.S. treasury securities | 66,489 |  |  | — |  |  | — |  |  | 66,489 |
Corporate bonds | — |  |  | 19,720 |  |  | — |  |  | 19,720 |
Commercial paper | — |  |  | 18,529 |  |  | — |  |  | 18,529 |
Liabilities |  |  |  |  |  |  |
Redeemable convertible preferred stock warrants | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
| December 31, 2017
| Level 1 |  | Level 2 |  | Level 3 |  | Total
Assets |  |  |  |  |  |  |
Money market funds[1] | $ | 22,115 |  |  | $ | — |  |  | $ | — |  |  | $ | 22,115 |
Liabilities |  |  |  |  |  |  |
Redeemable convertible preferred stock warrants | $ | — |  |  | $ | — |  |  | $ | 422 |  |  | $ | 422 |
[1] | Included in cash and cash equivalents on the consolidated balance sheet
Summary of Changes in Fair Value of the Redeemable Convertible Preferred Stock Warrants | The following table sets forth a summary of the changes in the fair value of the redeemable convertible preferred stock warrants, the Company’s Level 3 financial liability, which is measured on a recurring basis (in thousands):
Balances at December 31, 2017 | $ | 422 |
Change in fair value recorded in other (income) expense, net | 826 |
Conversion of preferred stock warrants to common stock warrants | (1,248 | )
Balances at December 31, 2018 | $ | — |

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- Definition Tabular disclosure of the fair value measurement of liabilities using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes attributable to the following: (1) total gains or losses for the period (realized and unrealized), segregating those gains or losses included in earnings (or changes in net assets), and gains or losses recognized in other comprehensive income (loss) and a description of where those gains or losses included in earnings (or changes in net assets) are reported in the statement of income (or activities); (2) purchases, sales, issues, and settlements (each type disclosed separately); and (3) transfers in and transfers out of Level 3 (for example, transfers due to changes in the observability of significant inputs) by class of liability. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19279-110258 + Details
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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19190-110258 + Details
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